I'm unable to connect to my localhost on port 80 while running WAMP at a hotel. Has anybody had these sorts of issues before? I'd like to be able to do some development work during my stay.

I realize that my WAMP server may be restricted from serving pages between computers...and why this might be a restriction. But certainly, I should be able to do a simple loopback so that PHP can run in the browser?

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Misconfigured proxy settings - You have to specifically tell your browser what not to send to the server (at least in Firefox you do). By default it doesn't send localhost or 127.*, but this may of changed. Check the settings. Note that FoxyProxy in Firefox has this issue

No entry in hosts file - Don't know why this would of changed, but check your hosts file and see if 127.0.0.1 localhost is there

Old cache - Maybe your browser is caching something weird. Clear it, restart the browser, and see if its fixed